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8125696991
If possible that after suspend, cfg80211 will receive request to disconnect what require action on interface that was removed during suspend. Problem can manifest itself by various warnings similar to below one: WARNING: at net/mac80211/driver-ops.h:12 ieee80211_bss_info_change_notify+0x2f9/0x300 [mac80211]() wlan0: Failed check-sdata-in-driver check, flags: 0x4 Call Trace: [<c043e0b3>] warn_slowpath_fmt+0x33/0x40 [<f83707c9>] ieee80211_bss_info_change_notify+0x2f9/0x300 [mac80211] [<f83a660a>] ieee80211_recalc_ps_vif+0x2a/0x30 [mac80211] [<f83a6706>] ieee80211_set_disassoc+0xf6/0x500 [mac80211] [<f83a9441>] ieee80211_mgd_deauth+0x1f1/0x280 [mac80211] [<f8381b36>] ieee80211_deauth+0x16/0x20 [mac80211] [<f8261e70>] cfg80211_mlme_down+0x70/0xc0 [cfg80211] [<f8264de1>] __cfg80211_disconnect+0x1b1/0x1d0 [cfg80211] To fix the problem disconnect from any associated network before suspend. User space is responsible to establish connection again after resume. This basically need to be done by user space anyway, because associated stations can go away during suspend (for example NetworkManager disconnects on suspend and connect on resume by default). Patch also handle situation when driver refuse to suspend with wowlan configured and try to suspend again without it. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
164 lines
3.6 KiB
C
164 lines
3.6 KiB
C
/*
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* This file provides /sys/class/ieee80211/<wiphy name>/
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* and some default attributes.
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*
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* Copyright 2005-2006 Jiri Benc <jbenc@suse.cz>
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*
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* This file is GPLv2 as found in COPYING.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/nl80211.h>
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#include <linux/rtnetlink.h>
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#include <net/cfg80211.h>
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#include "sysfs.h"
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#include "core.h"
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#include "rdev-ops.h"
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static inline struct cfg80211_registered_device *dev_to_rdev(
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struct device *dev)
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{
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return container_of(dev, struct cfg80211_registered_device, wiphy.dev);
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}
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#define SHOW_FMT(name, fmt, member) \
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static ssize_t name ## _show(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return sprintf(buf, fmt "\n", dev_to_rdev(dev)->member); \
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}
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SHOW_FMT(index, "%d", wiphy_idx);
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SHOW_FMT(macaddress, "%pM", wiphy.perm_addr);
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SHOW_FMT(address_mask, "%pM", wiphy.addr_mask);
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr,
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char *buf) {
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struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
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return sprintf(buf, "%s\n", dev_name(&wiphy->dev));
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}
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static ssize_t addresses_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct wiphy *wiphy = &dev_to_rdev(dev)->wiphy;
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char *start = buf;
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int i;
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if (!wiphy->addresses)
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return sprintf(buf, "%pM\n", wiphy->perm_addr);
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for (i = 0; i < wiphy->n_addresses; i++)
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buf += sprintf(buf, "%pM\n", &wiphy->addresses[i].addr);
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return buf - start;
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}
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static struct device_attribute ieee80211_dev_attrs[] = {
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__ATTR_RO(index),
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__ATTR_RO(macaddress),
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__ATTR_RO(address_mask),
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__ATTR_RO(addresses),
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__ATTR_RO(name),
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{}
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};
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static void wiphy_dev_release(struct device *dev)
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{
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struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
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cfg80211_dev_free(rdev);
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}
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static int wiphy_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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/* TODO, we probably need stuff here */
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return 0;
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}
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static void cfg80211_leave_all(struct cfg80211_registered_device *rdev)
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{
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struct wireless_dev *wdev;
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list_for_each_entry(wdev, &rdev->wdev_list, list)
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cfg80211_leave(rdev, wdev);
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}
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static int wiphy_suspend(struct device *dev, pm_message_t state)
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{
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struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
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int ret = 0;
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rdev->suspend_at = get_seconds();
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rtnl_lock();
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if (rdev->wiphy.registered) {
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if (!rdev->wowlan)
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cfg80211_leave_all(rdev);
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if (rdev->ops->suspend)
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ret = rdev_suspend(rdev, rdev->wowlan);
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if (ret == 1) {
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/* Driver refuse to configure wowlan */
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cfg80211_leave_all(rdev);
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ret = rdev_suspend(rdev, NULL);
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}
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}
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rtnl_unlock();
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return ret;
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}
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static int wiphy_resume(struct device *dev)
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{
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struct cfg80211_registered_device *rdev = dev_to_rdev(dev);
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int ret = 0;
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/* Age scan results with time spent in suspend */
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cfg80211_bss_age(rdev, get_seconds() - rdev->suspend_at);
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if (rdev->ops->resume) {
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rtnl_lock();
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if (rdev->wiphy.registered)
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ret = rdev_resume(rdev);
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rtnl_unlock();
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}
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return ret;
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}
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static const void *wiphy_namespace(struct device *d)
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{
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struct wiphy *wiphy = container_of(d, struct wiphy, dev);
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return wiphy_net(wiphy);
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}
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struct class ieee80211_class = {
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.name = "ieee80211",
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.owner = THIS_MODULE,
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.dev_release = wiphy_dev_release,
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.dev_attrs = ieee80211_dev_attrs,
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.dev_uevent = wiphy_uevent,
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.suspend = wiphy_suspend,
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.resume = wiphy_resume,
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.ns_type = &net_ns_type_operations,
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.namespace = wiphy_namespace,
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};
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int wiphy_sysfs_init(void)
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{
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return class_register(&ieee80211_class);
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}
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void wiphy_sysfs_exit(void)
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{
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class_unregister(&ieee80211_class);
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}
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